http://www.halfgaar.net/posts/2008-05/crt-socket-back

There are no parts except a few SMD capacitors, as far as
I can see. And there
is nothing whatsoever in the white body (I desoldered it
to have a look.

As posted, the spark gaps may be physically inside the crt
socket assembly itself. The odds of disassembly and proper
reassembly of most of these sockets is actually relatively
low. It may be done with proper tools and techniques.
What you may find is that due to arcing at the gaps or
external contaminates that the surfaces may have become
carbonized and pitted. At that point it may be best to
look for a new crt socket and just replace it.

What are the components SGH30,31,32? These are between the
cathodes and ground. These may be you spark gaps.

David